CPC Main Group
C01B 21/00 Nitrogen; Compounds thereof
6 direct subcodes
Child Classifications
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- C01B 21/02 Preparation of nitrogen (by decomposition of ammonia C01B3/047)
- C01B 21/04 Purification or separation of nitrogen (by liquefying F25J)
- C01B 21/06 Binary compounds of nitrogen with metals, with silicon, or with boron, (azides C01B21/08)
- C01B 21/08 Hydrazoic acid; Azides; Halogen azides
- C01B 21/082 Compounds containing nitrogen and non-metals (C01B21/06, C01B21/08 take precedence)
- C01B 21/20 Nitrogen oxides; Oxyacids of nitrogen; Salts thereof